Low-Complexity Hybrid Precoding and Combining Scheme Based on Array Response Vectors

The hybrid precoding and combining algorithms for mmWave massive multiple-input multiple-output (MIMO) systems must consider the trade-off between the complexity and performance of the system. Unfortunately, because of the unit-norm constraint imposed by the use of phase shifters, the optimization o...

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Published in:IEEE Wireless Communications and Networking Conference : [proceedings] : WCNC pp. 1 - 6
Main Authors: Bahingayi, Eduard Elias, Lee, Kyungchun
Format: Conference Proceeding
Language:English
Published: IEEE 01.05.2020
Subjects:
array response vectors
Baseband
combining
Dictionaries
dictionary
Massive MIMO
Matrix decomposition
Millimeter wave
multiple-input multiple-output (MIMO)
Precoding
Radio frequency
Spectral efficiency
subset selection
ISSN:1558-2612
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Abstract The hybrid precoding and combining algorithms for mmWave massive multiple-input multiple-output (MIMO) systems must consider the trade-off between the complexity and performance of the system. Unfortunately, because of the unit-norm constraint imposed by the use of phase shifters, the optimization of the radio frequency (RF) precoder and combiner becomes a non-convex problem. As a consequence, the algorithm for hybrid precoding and combining design often incurs high complexity. This paper proposes a low-complexity algorithm for hybrid precoding and combining design based on array response vectors. The proposed algorithm considers a decoupled optimization scheme between the RF and baseband domains for the spectral efficiency-maximization problem. In the RF domain, we propose an incremental successive selection method to find a subset of array response vectors from a dictionary, which forms the RF precoding/combining matrices. For the digital domain, we employ singular-value decomposition (SVD) of the low-dimensional effective channel matrix to generate the digital baseband precoder and combiner. Through numerical simulation, we show that the proposed algorithm achieves nearoptimal performance with 89.9 % - 99.4% complexity reduction compared to the conventional state-of-the-art hybrid precoding and combining algorithm.
AbstractList The hybrid precoding and combining algorithms for mmWave massive multiple-input multiple-output (MIMO) systems must consider the trade-off between the complexity and performance of the system. Unfortunately, because of the unit-norm constraint imposed by the use of phase shifters, the optimization of the radio frequency (RF) precoder and combiner becomes a non-convex problem. As a consequence, the algorithm for hybrid precoding and combining design often incurs high complexity. This paper proposes a low-complexity algorithm for hybrid precoding and combining design based on array response vectors. The proposed algorithm considers a decoupled optimization scheme between the RF and baseband domains for the spectral efficiency-maximization problem. In the RF domain, we propose an incremental successive selection method to find a subset of array response vectors from a dictionary, which forms the RF precoding/combining matrices. For the digital domain, we employ singular-value decomposition (SVD) of the low-dimensional effective channel matrix to generate the digital baseband precoder and combiner. Through numerical simulation, we show that the proposed algorithm achieves nearoptimal performance with 89.9 % - 99.4% complexity reduction compared to the conventional state-of-the-art hybrid precoding and combining algorithm.
Author Lee, Kyungchun
Bahingayi, Eduard Elias
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  givenname: Kyungchun
  surname: Lee
  fullname: Lee, Kyungchun
  organization: Seoul National University of Science and Technology,Department of Electrical and Information Engineering Research Center for Electrical and Information Technology,Seoul,Republic of Korea
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Snippet The hybrid precoding and combining algorithms for mmWave massive multiple-input multiple-output (MIMO) systems must consider the trade-off between the...
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SubjectTerms array response vectors
Baseband
combining
Dictionaries
dictionary
Massive MIMO
Matrix decomposition
Millimeter wave
multiple-input multiple-output (MIMO)
Precoding
Radio frequency
Spectral efficiency
subset selection
Title Low-Complexity Hybrid Precoding and Combining Scheme Based on Array Response Vectors
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